Slider for slide fasteners



Nov. 26, 1940. N. J. vPoux 2,222,988,

SLIDER FOR SLIDE FASTENERS Filed Aug. 5, 1938 mmm INVENTORT Noel JPouac 4 A TTORNEYS.

a Patented Nov. 2e, 1940 Narco STATES 2,222,928 a suona Fon SLIDE FA'STENERS Noel J. Poux, Meadville, Pa.,l assignor to Talon, Inc., acorporation of Pennsylvania Application August-5, 1938, Serial No. 223,288 2 claims (ci. 24-2o5.5)

This'invention relates to improvements in automatic lock sliders for separable interlocking fasteners, and is especially concerned with providing a slider of this type which will be more easily manufactured'and very reliable in' operation.

In the present invention it is an object to provide an automatic slider in which the locking arm is not xed at any certain bearing, but which is free to slide out of locking engagement and to Aprovide for the locking arm to be protected by a cap, such cap receiving the main force transmitted by the pull tab.

Another object is to provide a positive means to dlsengage the locking -arm automatically by longitudinal pull on the pull tab.

Still another object is to eliminate the tendency for the locking device to ratchet over the fastener elements.

A still further object is to provide a Adesign whereby all delicate bearings will be eliminated and the whole structure will be small and compact, yet extremely strong. v

A further object is to provide in a slider of this type an arrangement of parts such that the assembly will beextremely simplified, and one that can be manufactured easily by molding.

With these and other objects in view, I have devised the arrangement embodying my invention as described in the following specication and illustrated in the accompanying drawing of which,

Fig. 1 is a plan view of a part of a separable fastener showing one of my improved sliders Fig. 2 is a side view of the slider on a section of fastener with parts broken away to facilitate lilustration and shows the device in locked yposi- Fig. 3 is a cross-sectional view on the line' 3 3 of Fig. l, showingthe locking arm in unlocked position; h

Fig. 4 is a cross-section showing the upper portion of the vslider with the locking arm in its backward and unlocked position and positively relieved from any possible engagement with the fastener elements;

Fig. 5 is a perspective view illustrating the structure of the top slider body; w

Fig. 6 is a perspective view of the locking arm;

Fig. 7 is a cross-section on the line l-'I of Fig. 1; i

Fig. 8 shows a modification of the present invention and illustrates the upper portion of the slider body; and f the locking arm 22.

Fig. 9 is a longitudinal cross-section' of Fig. 8.

The slider is formed of any known material, and in any suitable size and shape to fit the fastener on which it is used. The fastener illustrated is of wellknown type comprising fabric 5 tapes 8, having closely spaced interlocking fastener elements 9. attached to the adjacent edges of the tapes. -The slider body comprises upper and lower plates I I and I2 respectively, with side anges I3 for guiding the fastener elements into l0 engagement.

In forming the upper slider plate II, a cap I5' is formed integral with said plate and extends lengthwise of the slider body in a central position. The ca p comprises a closed end I6, with l5 recesses I1 formed on either side to be engaged by the slider pull tab bearings. Also centrally located and integral with said slider body and cap is formed a guide rail I8 extending the full length of the slider cap. Near the front end of the rail 20 I8 under the slider cap is an opening I9 in the slider body. 'Ihis opening I9 extends along said rail a suitable distance and is substantially greater in length than width and formed at its. rearward termination with an inclined surface 20. 25 The opening receives the locking projection 2I of The term rearward or its equivalent backward," as used herein and in the appended claims, has reference to the direction extending toward that end of the fastener to 30 which the slider is moved when the fastener is closed, that is, the wide end of the slider would be its rear end and when it is moved to close the fastener, it is moved backwardly.

'Thellocking arm 22 shown in Fig. 6 is made 35 preferably of a flat piece of material bent over at both ends at approximately or less. The entire length of the arm will be considerably less than the length of the slider cap I5 which is to receive the locking arm. At each end of the 40 turned-'down portion of the locking arm there are cut out notches 23 to fit over theV rail I8 and permit the locking arm to move freely thereon. Said looking arm will be held in position by a .flat spring 24 riding freely against the locking arm 45 .and the' upper interior surface of the'slider cap I5.

The slider in conjunction with rail I8 is of proper proportions to accommodate these parts.

It will be observed that the entire slider body may easily be made by molding or die-casting, the 5 cores for the cap being drawn endwise from the slider body.

Assembling the locking means is accomplished by introducing the parts through the open end 25 of the slider cap. The locking arm 22 slides 55 freely over the rail I8 and the locking projection 20 protrudes through the opening I9 in the slider body. The spring 24 is assembled at this time and serves to hold the locking arm in proper position, as illustrated. The final step in assembly of the locking means is to bend down at point 26 h the portion of material 21 left for this purpose as shown in Figs. 2 and 5.

The pull device for the slider body may be of any convenient form and the one shown herein comprises a metal tab 2l bifurcated at one end to embrace the locking arm and slider cap. The

f trunnions or bearings are formed not of usual shape, but in shape of cams 29. The width of such cams is slightly less than the height of the slider cap recess I1. 'I'his arrangement permits the slider cap to carry the main force of the pull rather than the locking means.

In the operation of this improved lock slider it is evident that any upward swinging movement on the pull tab 28 will affect the cam 29 and lift the locking arm upward and out of locked position. Any further movement will bring the pull tab bearings into contact with the side recesses I1 of the slider cap and from that instant the main force of the pull will be directed to the sides of the slider cap. The slider will be held by spring 24 in locked position when caml 29 lies parallel to the plane of the slider body, as shown in Fig. 2, and in unlocked position, as shown in Fig. 3. As shown in Fig. 3 any force operating to open the fastener will act on the locking member until the locking projection is raised clear of the fastener elements. The fact that the mainforce of the pull is carried on the slider cap I5 relieves not only heavy strain from the locking arm but likewise prevents positionA ing spring 24 from being squeezed to the point of weakening or losing its set.

In closing movement, shown in` Fig. 4, the pull tab trunnions engage the locking member, and

Dull it backward until it rides over the inclined surface 20. Thus the lock point is held out of engagement with the fastener elements instead of ratcheting over them.

Figs. 8 and 9 show a modified form of my invention. In this form the cam bearings on the pull tab may be replaced by regular trunnions such as plain round bearings. To lift the locking means from engagement with the fastener elementso there are lproperly spaced inclined notches II formed within the sides of the slider cap 32. I'hese notches serve to direct the pull tab bearing 3l to lift thel locking means 2I out of engagement. The same inclined surface 2l prevents ratcheting of the locking means in closing the fastener. i

In this modified form the slider is in locked is urged to travel in the inclined notches 3l. In the unlocked position when the pull tab is released, spring 24 immediately urges locking means to move again intovengagement with the fastener elements.

From the above description it will be understood that the aims and objects of my invention have been accomplished, and while I have shown two embodiments of my invention, it is understood they were shown only for purposes of illustration and description and that various other forms may be devised within the scope of my invention as defined in the appended claims.

What I claim as my invention is:

1. A slider for slide fasteners comprising a slider body having a recessed cap, a locking member loosely lmounted insaid cap and shiftable longitudinally therein, cooperating cam surfaces on the slider body and locking member to lift the locking member out of locking engagement upon backward movement of the locking member, and a pull tab operatively connected to the slider body and locking' member for moving the locking member backwardly and for moving the slider as a whole.

`2. A slider for slide fasteners comprising a slider body having a fastener member receiving channel therein and having an opening through the slider body extending into the slider channel adjacent the forward end thereof, said 1&0

slider body also having an upstanding cap member extendinglongitudinally thereof and over saidvopening, said cap member being hollow to provide a recess therein, a locking member substantially shorter than said recess and movable longitudinally in said recess, said locking member being movable vertically also in said recess and having a locking projection at its forward end disposed directly opposite said opening in the forward position of said locking member, a spring normally. urging said locking member inwardly of said slider toward locklng position, the rear wall of said opening being inclined backwardly and outwardly, said cap member having slots in its side walls, a pull member having trunnions extending through said slots, and means on said locking member engaged' by said trunnions upon rearward movement of the pull member to effect backward sliding movel ment of the locking member, whereby the locking projection is slidably drawn out of'locking position when the pull is moved backwardly to close the fastener, said locking ,member also having means adjacent its forward end engaged by said trunnions to lift the locking projection out of locking position. upon exertion of outward pull on the locking member to open the fastener.

' NOEL J. POUX. 

